bsd/netinet6/udp6_output.c

   1 /*
   2  * Copyright (c) 2000-2011 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29
  30 /*      $FreeBSD: src/sys/netinet6/udp6_output.c,v 1.1.2.3 2001/08/31 13:49:58 jlemon Exp $     */
  31 /*      $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $    */
  32
  33 /*
  34  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
  35  * All rights reserved.
  36  *
  37  * Redistribution and use in source and binary forms, with or without
  38  * modification, are permitted provided that the following conditions
  39  * are met:
  40  * 1. Redistributions of source code must retain the above copyright
  41  *    notice, this list of conditions and the following disclaimer.
  42  * 2. Redistributions in binary form must reproduce the above copyright
  43  *    notice, this list of conditions and the following disclaimer in the
  44  *    documentation and/or other materials provided with the distribution.
  45  * 3. Neither the name of the project nor the names of its contributors
  46  *    may be used to endorse or promote products derived from this software
  47  *    without specific prior written permission.
  48  *
  49  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  50  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  51  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  52  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  53  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  54  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  55  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  56  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  57  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  58  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  59  * SUCH DAMAGE.
  60  */
  61
  62 /*
  63  * Copyright (c) 1982, 1986, 1989, 1993
  64  *      The Regents of the University of California.  All rights reserved.
  65  *
  66  * Redistribution and use in source and binary forms, with or without
  67  * modification, are permitted provided that the following conditions
  68  * are met:
  69  * 1. Redistributions of source code must retain the above copyright
  70  *    notice, this list of conditions and the following disclaimer.
  71  * 2. Redistributions in binary form must reproduce the above copyright
  72  *    notice, this list of conditions and the following disclaimer in the
  73  *    documentation and/or other materials provided with the distribution.
  74  * 3. All advertising materials mentioning features or use of this software
  75  *    must display the following acknowledgement:
  76  *      This product includes software developed by the University of
  77  *      California, Berkeley and its contributors.
  78  * 4. Neither the name of the University nor the names of its contributors
  79  *    may be used to endorse or promote products derived from this software
  80  *    without specific prior written permission.
  81  *
  82  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  83  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  84  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  85  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  86  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  87  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  88  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  89  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  90  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  91  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  92  * SUCH DAMAGE.
  93  *
  94  *      @(#)udp_var.h   8.1 (Berkeley) 6/10/93
  95  */
  96
  97 #include <sys/param.h>
  98 #include <sys/malloc.h>
  99 #include <sys/mbuf.h>
 100 #include <sys/protosw.h>
 101 #include <sys/socket.h>
 102 #include <sys/socketvar.h>
 103 #include <sys/sysctl.h>
 104 #include <sys/errno.h>
 105 #include <sys/stat.h>
 106 #include <sys/systm.h>
 107 #include <sys/proc.h>
 108 #include <sys/syslog.h>
 109
 110 #include <machine/endian.h>
 111
 112 #include <net/if.h>
 113 #include <net/route.h>
 114 #include <net/if_types.h>
 115 #include <net/ntstat.h>
 116
 117 #include <netinet/in.h>
 118 #include <netinet/in_var.h>
 119 #include <netinet/in_systm.h>
 120 #include <netinet/ip.h>
 121 #include <netinet/ip_var.h>
 122 #include <netinet/in_pcb.h>
 123 #include <netinet/udp.h>
 124 #include <netinet/udp_var.h>
 125 #include <netinet/ip6.h>
 126 #include <netinet6/ip6_var.h>
 127 #include <netinet6/in6_pcb.h>
 128 #include <netinet6/udp6_var.h>
 129 #include <netinet/icmp6.h>
 130 #include <netinet6/ip6protosw.h>
 131
 132 #ifdef IPSEC
 133 #include <netinet6/ipsec.h>
 134 #ifdef INET6
 135 #include <netinet6/ipsec6.h>
 136 #endif
 137 extern int ipsec_bypass;
 138 #endif /*IPSEC*/
 139
 140 #include "faith.h"
 141
 142 #include <net/net_osdep.h>
 143
 144 /*
 145  * UDP protocol inplementation.
 146  * Per RFC 768, August, 1980.
 147  */
 148
 149 #define in6pcb          inpcb
 150 #define udp6stat        udpstat
 151 #define udp6s_opackets  udps_opackets
 152
 153 static __inline__ u_int16_t
 154 get_socket_id(struct socket * s)
 155 {
 156         u_int16_t               val;
 157
 158         if (s == NULL) {
 159             return (0);
 160         }
 161         val = (u_int16_t)(((uintptr_t)s) / sizeof(struct socket));
 162         if (val == 0) {
 163                 val = 0xffff;
 164         }
 165         return (val);
 166 }
 167
 168 int
 169 udp6_output(in6p, m, addr6, control, p)
 170         struct in6pcb *in6p;
 171         struct mbuf *m;
 172         struct mbuf *control;
 173         struct sockaddr *addr6;
 174         struct proc *p;
 175 {
 176         u_int32_t ulen = m->m_pkthdr.len;
 177         u_int32_t plen = sizeof(struct udphdr) + ulen;
 178         struct ip6_hdr *ip6;
 179         struct udphdr *udp6;
 180         struct in6_addr *laddr, *faddr;
 181         u_short fport;
 182         int error = 0;
 183         struct ip6_pktopts opt, *optp = NULL;
 184         struct ip6_moptions *im6o;
 185         int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
 186         int flags;
 187         struct sockaddr_in6 tmp;
 188         struct  in6_addr storage;
 189         mbuf_traffic_class_t mtc = MBUF_TC_UNSPEC;
 190         struct ip6_out_args ip6oa = { IFSCOPE_NONE, 0 };
 191
 192         if (in6p->inp_flags & INP_BOUND_IF)
 193                 ip6oa.ip6oa_boundif = in6p->inp_boundif;
 194
 195         ip6oa.ip6oa_nocell = (in6p->inp_flags & INP_NO_IFT_CELLULAR) ? 1 : 0;
 196
 197         if (control) {
 198                 mtc = mbuf_traffic_class_from_control(control);
 199
 200                 if ((error = ip6_setpktopts(control, &opt, NULL, IPPROTO_UDP)) != 0)
 201                         goto release;
 202                 optp = &opt;
 203         } else
 204                 optp = in6p->in6p_outputopts;
 205
 206         if (addr6) {
 207                 /*
 208                  * IPv4 version of udp_output calls in_pcbconnect in this case,
 209                  * which needs splnet and affects performance.
 210                  * Since we saw no essential reason for calling in_pcbconnect,
 211                  * we get rid of such kind of logic, and call in6_selectsrc
 212                  * and in6_pcbsetport in order to fill in the local address
 213                  * and the local port.
 214                  */
 215                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr6;
 216                 if (sin6->sin6_port == 0) {
 217                         error = EADDRNOTAVAIL;
 218                         goto release;
 219                 }
 220
 221                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
 222                         /* how about ::ffff:0.0.0.0 case? */
 223                         error = EISCONN;
 224                         goto release;
 225                 }
 226
 227                 /* protect *sin6 from overwrites */
 228                 tmp = *sin6;
 229                 sin6 = &tmp;
 230
 231                 faddr = &sin6->sin6_addr;
 232                 fport = sin6->sin6_port; /* allow 0 port */
 233
 234                 if (IN6_IS_ADDR_V4MAPPED(faddr)) {
 235                         if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
 236                                 /*
 237                                  * I believe we should explicitly discard the
 238                                  * packet when mapped addresses are disabled,
 239                                  * rather than send the packet as an IPv6 one.
 240                                  * If we chose the latter approach, the packet
 241                                  * might be sent out on the wire based on the
 242                                  * default route, the situation which we'd
 243                                  * probably want to avoid.
 244                                  * (20010421 jinmei@kame.net)
 245                                  */
 246                                 error = EINVAL;
 247                                 goto release;
 248                         } else
 249                                 af = AF_INET;
 250                 }
 251
 252                 /* KAME hack: embed scopeid */
 253                 if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, NULL,
 254                     optp) != 0) {
 255                         error = EINVAL;
 256                         goto release;
 257                 }
 258
 259                 if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
 260                         laddr = in6_selectsrc(sin6, optp,
 261                             in6p, &in6p->in6p_route, NULL, &storage,
 262                             ip6oa.ip6oa_boundif, &error);
 263                 } else
 264                         laddr = &in6p->in6p_laddr;      /* XXX */
 265                 if (laddr == NULL) {
 266                         if (error == 0)
 267                                 error = EADDRNOTAVAIL;
 268                         goto release;
 269                 }
 270                 if (in6p->in6p_lport == 0 &&
 271                     (error = in6_pcbsetport(laddr, in6p, p, 0)) != 0)
 272                         goto release;
 273         } else {
 274                 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
 275                         error = ENOTCONN;
 276                         goto release;
 277                 }
 278                 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) {
 279                         if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
 280                                 /*
 281                                  * XXX: this case would happen when the
 282                                  * application sets the V6ONLY flag after
 283                                  * connecting the foreign address.
 284                                  * Such applications should be fixed,
 285                                  * so we bark here.
 286                                  */
 287                                 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
 288                                     "option was set for a connected socket\n");
 289                                 error = EINVAL;
 290                                 goto release;
 291                         } else
 292                                 af = AF_INET;
 293                 }
 294                 laddr = &in6p->in6p_laddr;
 295                 faddr = &in6p->in6p_faddr;
 296                 fport = in6p->in6p_fport;
 297         }
 298
 299         if (af == AF_INET)
 300                 hlen = sizeof(struct ip);
 301
 302         /*
 303          * Calculate data length and get a mbuf
 304          * for UDP and IP6 headers.
 305          */
 306         M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT);
 307         if (m == 0) {
 308                 error = ENOBUFS;
 309                 goto release;
 310         }
 311
 312         /*
 313          * Stuff checksum and output datagram.
 314          */
 315         udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
 316         udp6->uh_sport = in6p->in6p_lport; /* lport is always set in the PCB */
 317         udp6->uh_dport = fport;
 318         if (plen <= 0xffff)
 319                 udp6->uh_ulen = htons((u_short)plen);
 320         else
 321                 udp6->uh_ulen = 0;
 322         udp6->uh_sum = 0;
 323
 324         switch (af) {
 325         case AF_INET6:
 326                 ip6 = mtod(m, struct ip6_hdr *);
 327                 ip6->ip6_flow   = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK;
 328                 ip6->ip6_vfc    &= ~IPV6_VERSION_MASK;
 329                 ip6->ip6_vfc    |= IPV6_VERSION;
 330 #if 0                           /* ip6_plen will be filled in ip6_output. */
 331                 ip6->ip6_plen   = htons((u_short)plen);
 332 #endif
 333                 ip6->ip6_nxt    = IPPROTO_UDP;
 334                 ip6->ip6_hlim   = in6_selecthlim(in6p,
 335                                                  in6p->in6p_route.ro_rt ?
 336                                                  in6p->in6p_route.ro_rt->rt_ifp : NULL);
 337                 ip6->ip6_src    = *laddr;
 338                 ip6->ip6_dst    = *faddr;
 339
 340                 udp6->uh_sum = in6_cksum_phdr(laddr, faddr,
 341                     htonl(plen), htonl(IPPROTO_UDP));
 342                 m->m_pkthdr.csum_flags = CSUM_UDPIPV6;
 343                 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
 344
 345                 flags = IPV6_OUTARGS;
 346
 347                 udp6stat.udp6s_opackets++;
 348 #ifdef IPSEC
 349                 if (ipsec_bypass == 0 && ipsec_setsocket(m, in6p->in6p_socket) != 0) {
 350                         error = ENOBUFS;
 351                         goto release;
 352                 }
 353 #endif /*IPSEC*/
 354                 m->m_pkthdr.socket_id = get_socket_id(in6p->in6p_socket);
 355
 356                 set_packet_tclass(m, in6p->in6p_socket, mtc, 1);
 357
 358                 im6o = in6p->in6p_moptions;
 359                 if (im6o != NULL)
 360                         IM6O_ADDREF(im6o);
 361
 362                 error = ip6_output(m, optp, &in6p->in6p_route,
 363                     flags, im6o, NULL, &ip6oa);
 364
 365                 if (im6o != NULL)
 366                         IM6O_REMREF(im6o);
 367
 368                 if (error == 0 && nstat_collect) {
 369                         locked_add_64(&in6p->inp_stat->txpackets, 1);
 370                         locked_add_64(&in6p->inp_stat->txbytes, ulen);
 371                 }
 372
 373                 if (in6p->in6p_route.ro_rt != NULL) {
 374                         struct rtentry *rt = in6p->in6p_route.ro_rt;
 375                         unsigned int outif;
 376
 377                         if ((rt->rt_flags & RTF_MULTICAST) ||
 378                             in6p->in6p_socket == NULL ||
 379                             !(in6p->in6p_socket->so_state & SS_ISCONNECTED)) {
 380                                 rt = NULL;      /* unusable */
 381                         }
 382                         /*
 383                          * Always discard the cached route for unconnected
 384                          * socket or if it is a multicast route.
 385                          */
 386                         if (rt == NULL) {
 387                                 rtfree(in6p->in6p_route.ro_rt);
 388                                 in6p->in6p_route.ro_rt = NULL;
 389                         }
 390                         /*
 391                          * If this is a connected socket and the destination
 392                          * route is not multicast, update outif with that of
 393                          * the route interface index used by IP.
 394                          */
 395                         if (rt != NULL && (outif = rt->rt_ifp->if_index) !=
 396                             in6p->in6p_last_outif)
 397                                 in6p->in6p_last_outif = outif;
 398                 }
 399                 break;
 400         case AF_INET:
 401                 error = EAFNOSUPPORT;
 402                 goto release;
 403         }
 404         goto releaseopt;
 405
 406 release:
 407         m_freem(m);
 408
 409 releaseopt:
 410         if (control) {
 411                 if (optp == &opt)
 412                         ip6_clearpktopts(optp, -1);
 413                 m_freem(control);
 414         }
 415         return(error);
 416 }